Giant Mine near Yellowknife, in the Northwest Territories, extracted a lot of gold in its time. Then the gold ran out, and the company went bankrupt in 2004. They left behind 237,000 metric tons of arsenic trioxide as a side effect of the mining operation, although that amount does not include the arsenic that has escaped into the environment. You can read more about Giant Mine's history here. The Canadian government was left to deal with the arsenic. Tom Scott introduces us to the technology that won't destroy the arsenic, but will keep the dust from seeping into the air and water. Read more about the Giant Mine Remediation Project at its website. -via Digg
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